An extremely rare case of posttraumatic epidural hygroma in the left occipital supratentorial and infratentorial region is reported. A year and five months old child was admitted to the Clinic of Neurosurgery with sustained occipital head injury. She presented with drowsiness and vomiting due to intracranial hypertension. Initial computed tomography scan revealed left-sided fracture of the squamous part of the occipital bone without associated traumatic changes to the brain. A second spiral computed tomography scan was obtained two days later because of persisting symptoms of increased intracranial pressure. It demonstrated a newly formed left-sided epidural hygroma adjacent to the skull fracture in the left supratentorial and infratentorial occipital region. The case is discussed with emphasis on the mechanism of formation of epidural hygroma and an attempt has been made to outline the major predisposing factors leading to the development of this traumatic disease. Necessity for computed tomography follow-up is pointed out in order to diagnose delayed posttraumatic hygromas. The recommended surgical approach should include craniotomy centered at the site of the epidural hygroma and obligatory dural elevation by means of traction sutures to eliminate the posttraumatic epidural cavity.
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